中文摘要：

对滇石栎物种自然分布区南北方向的8个种群进行采样,其中包括分布区最南和最北边缘的种群.分析其叶片厚度、硬度、总酚含量和缩合单宁含量的种内变异及其相关性,主要探讨叶片防御性状对物种自然分布区形成的影响.研究结果表明,滇石栎叶片4个防御性状的种内变异系数分别为19.31%、43.72%、20.83%和32.56%.这种变异主要来源于种群间和种群内个体间,是滇石栎适应不同生境的结果.叶片化学防御随分布区海拔升高而增强,存在生长与防御的权衡关系.滇石栎最北端冕宁种群综合防御投入最大,采取低生长高防御的生活对策,成为滇石栎分布区北部边缘种群.最南端的屏边种群表现出较弱的防御能力,但生长达到种内最大值,采取快速生长的生活对策,成为滇石栎分布区南部边缘种群.滇石栎叶片防御性状的变化对物种沿纬度方向分布区的范围形成具有一定的作用.

英文摘要：

In order to study the effect on the formation of distribution of Lithocarpus dealbatus,intraspecific variation and covariation of thickness,hardness,total phenols content（ TPC） and condensed tannin（ CT） in leaves from 8 populations across the distribution area from north to south were quantified.The results showed that the variation of four defensive traits were 19.31%,43.72%,20.82% and 32.56%,respectively.The total intraspecific variation was contributed by the difference among populations and individuals. The values of chemical defense in leaves increased with rising elevation.The leaves from Lithocarpus dealbatus populations showed the trade-off tragedy between growth and defense.The populations from northern edge of distribution area had the heaviest integrated defensive investment which meant low growth and high defense,and formed the most northward edge of the distribution area. The populations from southern edge of distribution showed low defense and rapid growth,which formed the most southward distribution range.It is conclude that intraspecific variation of defensive traits of the leaves has effect on the distribution of Lithocarpus dealbatus along the latitude direction.